Konica 7920 Wiring Diagram 7920fv1e

FrameMaker Ver.5.5E(PC) 7915/7920 DIS/REASSEMBLY, ADJUSTMENT

01.02.09

DIS/REASSEMBLY,

ADJUSTMENT

18605

FrameMaker Ver.5.5E(PC) 7915/7920 DIS/REASSEMBLY, ADJUSTMENT

01.02.09

1. SERVICE INSTRUCTIONS ............................................................................. D-1

1-1. IDENTIFICATION OF FUSES ............................................... ............. .....D-1

1-2. PARTS WHICH MUST NOT BE TOUCHED ...........................................D-2

(1) Red Painted Screws ............................................ ......................... ...D-2

(2) Variable Resistors on Board ....... ............ .......................... ...............D-2

2. DISASSEMBLY/REASSEMBLY ......................................................................D-3

2-1. DOORS, COVERS, AND EXTERIOR PARTS:

IDENTIFICATION AND REMOVAL PROCEDURES ...............................D-3

2-2. REMOVAL OF CIRCUIT BOARDS AND OTHER

ELECTRICAL COMPONENTS ................................................................D-5

(1) Removal of the CCD Unit ................................................................ D-6

(2) Removal of the Image Processing Board ........................................D-6

(3) Removal of the IR PRIF Board ........................................................D-9

(4) Removal of the Scanner Motor Drive Board ....................................D-10

(5) Removal of the Flat Cable ............................................................... D-10

(6) Removal of DC Power Supply 2 ......................................................D-11

(7) Removal of the Paper Size Detecting Board ...................................D-13

(8) Removal of the LED Board and ATDC Sensors Y, M, and C ..........D-13

2-3. MAINTENANCE SCHEDULE .................................................................. D-16

2-4. Guidelines for Life Specifications Values by Unit ....................................D-18

2-5. Removal of Units .....................................................................................D-20

(1) Removal of the Toner Hopper Unit ..................................................D-21

(2) Removal of the LED Unit .................................................................D-22

2-6. Cleaning and Disassembly of the IR Unit ................................................D-25

(1) Cleaning of the Scanner Rails ........................................................ .D-25

(2) Cleaning of the Mirrors (1st/2nd/3rd) ...............................................D-25

(3) Cleaning of the Lens ........................... .... .. ....... .. .. .... .. .. ....... .. .... .. .. ...D-25

(4) Cleaning of the Original Glass ................ .......................... ...............D-26

(5) Removal of the Original Glass Cooling Fan Motor ......................... .D-26

(6) Removal of the Scanner Motor ........................................................D-26

(7) Removal of IR Cooling Fan Motor 2 ................................................D-27

(8) Removal of IR Cooling Fan Motor 1 ................................................D-28

(9) Removal of the Scanner Home Sensor ...........................................D-28

(10) Removal of the Or igin a l Co ver Detecting Sensor ............................D-29

(11) Removal of Original Size Detecting Sensors FD1 and FD2 ............D-29

(12) Removal of Origina l S i ze De tecting Sensor CD1 ............................D-30

(13) Removal of the Size Reset Switch ..................................................D-30

(14) Removal of the Scanner Assy .........................................................D-30

(15) Removal of the Exposure Lamp ......................................................D-31

(16) Removal of the Temperature Fuse .................................................. D-31

(17) Removal of the Scanner Drive Cables ............................................D-32

(18) Winding of the Scanner Drive Cables ..............................................D-33

2-7. CLEANING AND DISASSEMBLY OF THE ENGINE PARTS ................. D-38

(1) Cleaning of the Paper Take-Up Roll ................................................D-38

(2) Cleaning of the Paper Separator Roll ..............................................D-38

(3) Cleaning of the Synchroni zin g Ro lle rs ................... ..........................D-38

FrameMaker Ver.5.5E(PC) 7915/7920 DIS/REASSEMBLY, ADJUSTMENT

01.02.09

(4) Cleaning of the Paper Dust Remover ..............................................D-39

(5) Cleaning of the Transfer Belt Un it ............................................ .......D-39

(6) Cleaning of the LED ................................................ ........................D-40

(7) Cleaning of the Area around the Waste Toner Collecting Port ........D-40

(8) Cleaning of the Fusing Entrance Guide Plate .................................D-41

(9) Removal of the Imaging Unit Motor C/M/Y/Bk .................................D-41

(10) Removal of the Main Motor .............................................................D-43

(11) Removal of the Ozone Ventilation Fan Motor ..................................D-43

(12) Removal of the Fusing Drive Motor .................................................D-43

(13) Removal of the Fusing Pressure/Retraction Motor ..........................D-44

(14) Removal of the 1st Image Transfer Pressure/Retraction Motor ......D-45

(15) Removal of Toner Replenishing Motor C/Bk ...................................D-46

(16) Removal of Toner Replenishing Motor Y/M .....................................D-46

(17) Removal of the Cleaning Web Drive Motor .....................................D-46

(18) Removal of the Power Supply Cooling Fan Motor ...........................D-47

(19) Removal of Fusing Cooling Fan Motor 2 ......................................... D-48

(20) Removal of Fusing Cooling Fan Motor 1 ......................................... D-48

(21) Removal of the 2nd Image Transfer Pressure/Retraction Clutch ....D-50

(22) Remov a l o f the Synchronizing Roller Clutch .... ................. .. ............D-50

(23) Removal of the Manual Feed Paper Take-Up Clutch ......................D-51

(24) Removal of the Paper Take-Up Clutch ............................................D-52

(25) Removal of AIDC/Registration Sensor 1/2 ......................................D-53

(26) Removal of the Temperature/Humidity Sensor ...............................D-54

(27) Removal of the Toner Supply Door Sensor .....................................D-54

(28) Removal of the Manual Feed Paper Take-Up Sensor .....................D-54

(29) Removal of the 1st Image Transfer Retraction Position Sensor ......D-55

(30) Removal of the Double Feed Sensor ..............................................D-55

(31) Removal of the Drawer Set Sensor and Drawer Paper

Near-Empty Sensor ................ ......................... ............ ....................D-56

(32) Removal of the Left Door Switch ..................................................... D-57

(33) Removal of the Righ t Do o r Switch ...................................................D-57

(34) Removal of the Fr o n t Do o r Switch ............................. ......................D-58

(35) Removal of the Fusing Roller Rotation Detecting Sensor ...............D-58

(36) Removal of the Fusing Retraction Position Sensor .........................D -58

(37) Removal of the Exit Sensor .............................................................D-58

(38) Removal of the 2nd Image Transfer Pressure Position Sensor ......D-59

(39) Removal of the Synchronizing Roller Sensor ..................................D-59

(40) Removal of the OHP Detecting Sensor ...........................................D-59

(41) Removal of the CD Paper Size Detecting Sensor Assy ..................D-60

(42) Removal of the Paper Take-Up Roll ................................................D-60

(43) Removal of the Paper Separator Roll ..............................................D-61

(44) Removal of High Voltage Unit 1 ...................................................... D -61

(45) Removal of High Voltage Unit 2/3 ...................................................D-61

(46) Removal of DC Power Supply 1 ......................................................D-61

(47) Removal of the Charge Neutralizing Relay ..................................... D-62

(48) Removal of the Waste Toner Full Detecting Sensor .......................D-62

(49) Removal of the Waste Toner Bottle Set Sensor ..............................D-62

FrameMaker Ver.5.5E(PC) 7915/7920 DIS/REASSEMBLY, ADJUSTMENT

01.02.09

(50) Removal of the Toner Empty Switch (Y/M/C/Bk) ............. ................D-63

3. ADJUSTMENTS ..............................................................................................D-64

3-1. ADJUSTMENT JIGS AND TOOLS USED (SPECIAL TOOLS) ...............D-64

3-2. OTHER TOOLS USED (ACCESSORY PARTS OF MACHINE) .............D-64

3-3. ADJUSTMENT REQUIREMENTS LIST .................................................. D-65

3-4. ADJUSTMENT OF SWITCHES ...............................................................D-66

(1) Microswitches .................................................................................. D-66

3-5. ADJUSTMENT OF BELT TENSION ........................................................ D-67

(1) Adjustment of the Scanner Motor Timing Belt .................................D-67

3-6. ELECTRICAL/IMAGE ADJUSTMENT .............................................. .......D-68

(1) Accessing the Tech. Rep. Mode ......................................................D-68

(2) Producing a Test Print .....................................................................D-68

(3) Touch Panel Adj. ......................................................... ....... .. .... .. .. ...D-69

(4) Top Margin ......................................................................................D-70

(5) Left Margin ............................................................................ ...........D-72

(6) Dup. Left Margin ..............................................................................D-73

(7) Paper Loop ......................................................................................D-74

(8) Color Shift Correctio n ............. ............ ............. ......................... .......D-75

(9) Fuser Nip ......................... ...................................... ..........................D-78

(10) Fuser Temp. .......... ............ .......................... ......................... ...........D-80

(11) Fuser Speed ....................................................................................D-81

(12) Left Image ..................................................................................... .. .D-82

(13) Top Image .......................................................................................D-83

(14) CD-Mag. ..........................................................................................D-84

(15) FD-Mag. ........................................................................................... D-85

(16) Org. Detect Sensor ..........................................................................D-86

(17) Gradation Adjust ..............................................................................D-87

(18) PRT Max Density ........................................... ..................................D-88

(19) PRT Highlight .................... .......................... ......................... ...........D-88

(20) Background Voltage Margin ............................................................D-89

4. OTHER ADJUSTMENTS .......................... ......................... ............ ..................D-90

4-1. Adjustment of the Position of the Scanner and 2nd/3rd

Mirrors Carriage .......................................................................................D-90

(1) Adjustment of the 2nd/3rd Mirrors Carriage Assy

for Parallel Alignment ......................................................................D-91

5. MISCELLANEOUS ..........................................................................................D-93

5-1. INSTALLATION OF THE MECHANICAL COUNTER (OPTION) ............ D-93

5-2. MO U N T IN G O F THE ORIGINAL SIZE DETECTING SENSORS

(OPTION) ................................................................................................. D-94

5-3. FLASH MEMORY ....................................................................................D-95

5-4. REMOUNTING RAM IC (IC5) ..................................................................D-97

iii

FrameMaker Ver.5.5E(PC) 7915/7920 DIS/REASSEMBLY, ADJUSTMENT

01.02.09

1. SERVICE INSTRUCTIONS

1-1. IDENTIFICATION OF FUSES

DC Power Supply 2 PU2 250 V 3 A (F1)

4004D100AB

DC Power Supply 1 PU1 125 V 15 A (F1) 120 V 10 A (F2) 125 V 15 A (F3) 125 V 15 A (F4)

4004D101AB

D-1

FrameMaker Ver.5.5E(PC) 7915/7920 DIS/REASSEMBLY, ADJUSTMENT

01.02.09

1-2. PARTS WHICH MUST NOT BE TOUCHED

(1) Red Painted Screws

Purpose of Application of Red Paint

• Red painted screws show that the assembly or unit secured can only be adjusted or set at the factory and should not be adjusted, set, or removed in the field.

• Note that when two or more screws are used on the part in questions, only one representative screw may be marked with red paint.

(2) Variable Resistors on Board

Do not turn the variable resistors on boards for which no adjusting instructions are given in ADJUSTMENT.

D-2

FrameMaker Ver.5.5E(PC) 7915/7920 DIS/REASSEMBLY, ADJUSTMENT

01.02.09

2. DISASSEMBLY/REASSEMBLY

2-1. DOORS, COVERS, AND EXTERIOR PARTS:

IDENTIFICATION AND REMOVAL PROCEDURES

Printer

4004D102AA

4004D103AA

4004D104AA

4004D105AA

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FrameMaker Ver.5.5E(PC) 7915/7920 DIS/REASSEMBLY, ADJUSTMENT

01.02.09

No. Name Removal Procedure

1 Original Glass Remove the IR Right Cover. → Remove the IR Rear Cover. →

2 IR Right Cover Remove two screws and the IR Right Cover. 3 Control Panel Remove two covers below the Control Panel. → Remove two

4 IR Front Cover Remove the Control Panel. → Remove one screw and two Control

5 IR Lower Front

Cover

6 IR Rear Upper

Cover

7 IR Rear Cover Disconnect the power cable and IR hookup cable. → Remove four

8 IR Left Cover Remove the IR Front Cover. → Remove the IR Rear Upper Cover. →

Remove one screw and the Original Glass fixing brackets (front and rear). → Remove the Original Glass.

screws, unplug one connector, and remove the Control Panel.

Panel fixing brackets. → Remove one screw and the Scanner Home Sensor Assy. → Remove the two upper joints from the Copier Stand.

→

Loosen two screws and remove the IR Front Cover. → Loosen two lower screws and remove two upper screws and the IR Front Cover.

Remove the Control Panel. → Demount the IR Unit from the Copier Stand. → Remove two screws and the IR Lower Front Cover.

Remove the Original Cover. → Remove three screws and the Rear Upper Cover.

screws and the IR Rear Cover.

Remove three screws and the IR Left Cover.

Printer

No. Name Removal Procedure

1 Rear Left

Cover

2 Hopper Door Open the Right Door. → Open the Upper Right Door. → Remove the

3 Panel Door Open the Front Door. → Open the Hopper Door. → Remove one

4 Front Door Open the Front Door. → Lift the Front Door off the copier. 5 Hopper Left

Cover

6 Paper Output

Cover

7 Rear Upper

Cover 8 Rear Cover Remove seven screws and the Rear Cover. 9 Rear Right

Cover

10 Front Right

Cover

Open the Left Door. → Remove the Waste Toner Bottle. → Remove the Ozone Filter. → Remove two screws and the Rear Left Cover.

actuator of the Toner Supply Door Sensor. → Snap off one retaining ring E type from the left hinge of the Hopper Door and slide the Hopper Door in closed position to the right to take it off.

screw and the Panel Door.

Open the Front Door. → Open the Hopper Door. → Remove one screw and lift the Hopper Left Cover upward to take it off.

Open the Right Door. → Open the Upper Right Door. → Remove two screws and the Paper Output Cover.

Remove the Paper Output Cover. → Remove the Rear Cover. → Remove three screws and the Rear Upper Cover.

Open the Right Door. → Remove one screw and the Rear Right Cover.

Remove the Panel Door. → Remove one screw and the Front Right Cover.

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FrameMaker Ver.5.5E(PC) 7915/7920 DIS/REASSEMBLY, ADJUSTMENT

01.02.09

2-2. REMOVAL OF CIRCUIT BOARDS AND OTHER

ELECTRICAL COMPONENTS

• When removing a circuit board or other electrical component, refer to “Handling of PWBs” and follow the corresponding removal procedures.

• The removal procedures given in the following omit the removal of connectors and screws securing the circuit board support or circuit board.

• Where it is absolutely necessary to touch the ICs and other electrical components on the board, be sure to ground your body.

PWB-IC

PWB-Z

PWB-D

Symbol Name Removal Procedures

PWB-A CCD Sensor Board PWB-C PWB-D IR PRIF Board PWB-IC PWB-Z Flat Cable

PU2 DC Power Supply 2

Image Processing Board

Scanner Motor Drive Board

☞ ☞ ☞ ☞ ☞

☞

D-6 D-6 D-9 D-10 D-10

D-11

PU2

PWB-A

PWB-C

4004D106AC

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FrameMaker Ver.5.5E(PC) 7915/7920 DIS/REASSEMBLY, ADJUSTMENT

01.02.09

(1) Removal of the CCD Unit

1. Remove the IR Right Cover and Original Glass.

2. Remove eight screws and the optical cover.

4004D001AC

3. Remove three screws and the imaging processing lid on the right inside the IR.

4004D002AB

4. Unplug three connectors.

5. Remove three screws and the CCD Unit.

4004D003AA

(2) Removal of the Image Processing Board

1. Remove the IR Right Cover, IR Front Cover, IR Lower Front Cover, and IR Rear Upper Cover.

2. Remove the Original Glass.

3. Remove eight screws and the optical cover.

4004D001AC

4. Remove three screws and the imaging processing lid on the right inside the IR.

4004D002AB

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FrameMaker Ver.5.5E(PC) 7915/7920 DIS/REASSEMBLY, ADJUSTMENT

01.02.09

5. Remove four screws and the metal bracket on the upper right of the IR.

4004D004AA

6. Unplug eight connectors on the Image Processing Board.

4004D005AA

7. Remove three screws that secure the Image Processing Unit on the right.

4004D006AA

4004D007AA

4004D008AA

8. Remove two screws and the image processing lid on the left inside the IR.

9. Unplug four connectors on the Image Processing Board.

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FrameMaker Ver.5.5E(PC) 7915/7920 DIS/REASSEMBLY, ADJUSTMENT

01.02.09

10. Remove two screws that secure the Image Processing Unit on the left.

4004D009AA

11. Remove the IR hookup cable.

4004D010AA

Precautions for Removal/Reinstallation of the IR Hookup Cable

• Be sure to hold onto the connector of the cable when removing or reinstalling the cable. NEVER pull on the cable.

• At reinstallation, make sure that the connector is not tilt.

• When securing the connector, use a flat-blade screwdriver and tighten the connector firmly.

4004D011AA

4004D012AC

12. Remove two screws and two washers.

13. Remove nine screws and the Image Processing Unit protective guide.

D-8

FrameMaker Ver.5.5E(PC) 7915/7920 DIS/REASSEMBLY, ADJUSTMENT

01.02.09

14. Pull out the Image Processing Unit.

4004D013AA

15. Remove 11 screws and the Image Processing Board.

4004D014AA

NOTE

• At reinstallation, make sure that the Image Pro-

cessing Board is properly connected to the IR PRIF Board.

4004D194AA

(3) Removal of the IR PRIF Board

4004D195AA

4004D196AA

1. Pull out the Image Processing Board Unit.

☞

D-6 (steps 1 through 14)

2. Remove five screws and the IR PRIF Board.

NOTE

• At reinstallation, make sure that the IR PRIF Board

is properly connected to the Image Processing Board.

D-9

FrameMaker Ver.5.5E(PC) 7915/7920 DIS/REASSEMBLY, ADJUSTMENT

01.02.09

(4) Removal of the Scanner Motor Drive Board

1. Remove the IR Right Cover, IR Rear Right Cover, IR Rear Upper Cover, and IR Rear Cover.

2. Remove two screws and the reinforcement frame.

4004D015AA

3. Unplug three connectors.

4. Remove one screw. Then, remove the Scanner Motor Drive Board from the PWB support.

4004D016AB

(5) Removal of the Flat Cable

1. Remove the IR Rear Upper Cover and IR Rear Cover.

2. Remove the Original Glass.

3. Remove the Scanner Assy.

4. Remove two screws, unplug one connector, and remove the Scanner Assy Flat Cable.

4004D025AA

4004D018AB

5. Unplug one connector and remove the harness from one wiring saddle.

6. Remove two screws and the Original Glass Cooling Fan Motor.

D-10

FrameMaker Ver.5.5E(PC) 7915/7920 DIS/REASSEMBLY, ADJUSTMENT

01.02.09

7. Remove one screw, unplug one connector, and remove the Flat Cable.

4004D019AA

(6) Removal of DC Power Supply 2

1. Remove the IR Rear Cover.

2. Remove two screws that secure the IR power receptacle.

4004D020AB

3. Remove six screws, two harness holders, and the DC Power Supply 2 cover.

4004D021AA

4004D022AA

4004D023AA

4. Remove one screw that secures DC Power Supply 2 in position.

5. Unplug six connectors.

6. Take off DC Power Supply 2 by sliding it to the right.

D-11

FrameMaker Ver.5.5E(PC) 7915/7920 DIS/REASSEMBLY, ADJUSTMENT

01.02.09

Printer

PWB-I

PWB-PIC

PWB-H

PWB-I1

PWB-LK

PWB-N3

PWB-N2

PWB-N1

PWB-T

PWB-S

PU1

4004D183AA

Symbol Name Removal Procedures

PWB-H MSC Board Remove the Rear Cover. → Remove the Rear Left Co ve r.

PWB-I Master Board Remove the Paper O utput Cover. → Unplug 21 connectors

PWB-I1 Paper Size Detecting

Board PWB-LK LED Board PWB-N1 ATDC Sensor Y PWB-N2 ATDC Sensor M PWB-N3 ATDC Sensor C PWB-PIC PIC Board Remove the Rear Cover. → Remove the Rear Left Co ve r.

PWB-S Paper Type Detection

Board

PWB-T Tech. Rep. Setting

Switches Board

Remove the PWB Shield Cover. → Unplug two connec-

→

tors and remove four screws and th e MSC Board.

and remove six screws and the Master Board.

D-13

☞

D-13

☞

Remove the PWB Shield Cover. → Remove the MSC

→

Board. → Unplug two connectors and remove 12 screws and the PIC Board.

Open the Front Door. → Remove one screw and the P aper Type Detection Board cover. → Unplug one connector and remove one screw and the Paper Type Detection Board.

Open the Front Door. → Remove the Right Front Cover. → Unplug one connector and remov e one screw and the Tech. Rep. Setting Switches Board.

D-12

FrameMaker Ver.5.5E(PC) 7915/7920 DIS/REASSEMBLY, ADJUSTMENT

01.02.09

(7) Removal of the Paper Size Detecting Board

1. Remove High Voltage Unit 1 and 2.

☞

D-56 (steps 1 through 8)

2. Remove two screws, unplug one connector, and remove the Paper Size Detecting Board.

4004D184AB

(8) Removal of the LED Board and ATDC Sensors Y, M, and C

NOTE

• Whenever the Imaging Unit has been slid out of the copier, be sure to cover it with the light blocking bag (black) or light blocking cloth for packing purposes and place it in a dark place. Avoid leaving it to stand for a long time.

1. Remove the LED Unit.

☞

D-22

✽

Removal of the LED Assy Bk

2. Remove two screws and the Right Guide.

4004D108AA

4004D110AA

4004D109AA

3. Remove two screws and the Right Guide for C.

4. Remove two screws and the Left Guide.

D-13

FrameMaker Ver.5.5E(PC) 7915/7920 DIS/REASSEMBLY, ADJUSTMENT

01.02.09

NOTE

• At reinstallation, ensure that the front hook makes positive engagement.

4004D197AA

5. Remove one screw and the holder.

4004D113AA

6. Remove four screws, unplug two connectors, and

remove the LED Assy Bk.

✽

Removal of the LED Assy C

4004D114AB

7. Remove two screws, unplug one connector, and

remove the ATDC Sensor C.

NOTE

• When the ATDC Sensor is replaced, the Imaging Unit should also be replaced.

4004D115AA

8. Remove two screws and the Left Guide.

4004D117AA

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FrameMaker Ver.5.5E(PC) 7915/7920 DIS/REASSEMBLY, ADJUSTMENT

01.02.09

NOTE

• At reinstallation, ensure that the front hook makes positive engagement.

4004D197AA

9. Remove one screw and the holder.

4004D118AA

10. Remove four screws, unplug two connectors, and

remove LED Assy C.

11. Following the same procedure as when removing

LED Assy C, remove LED Assemblies M and Y.

4004D119AB

4004D120AB

4004D121AB

12. Remove 23 screws and the LED Board Cover.

NOTE

• The illustration shows only the representative screw. Remove all (23 in total) LED Board Cover mounting screws.

13. Unplug two connectors.

14. Remove nine screws and the LED Board.

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FrameMaker Ver.5.5E(PC) 7915/7920 DIS/REASSEMBLY, ADJUSTMENT

01.02.09

2-3. MAINTENANCE SCHEDULE

• To ensure that the copier produces good copies and to extend its service life, it is recommended that the maintenance jobs described in this schedule be carried out as instructed.

Maintenance Cycle

PM Parts

Paper Take-Up Roll

Separator Roll Assy

Paper Take-Up Section

Scanner Rail

Mirrors (1st, 2nd, and 3rd)

IR Section

Lens

Original Glass Upon call ———

Transfer Belt Unit (✽1)

Transfer Roller Unit (✽1) — 121 K 111T44010 1 — Synchronizing Roller 60 K ——— Paper Dust Remover (✽1) 60 K 121 K 111T-2010 1 Waste Toner Bottle — (✽2) 111T-3210 1 —

Image Transfer Section

Around waste toner collecting port

Imaging Unit C/M/Y — 4562 M —

Imaging Unit Bk — 7204 M — 1 —

LED

Developing Section

Ozone Filter (✽1) — 121 K 111T32040 1 —

Fusing Unit — 102 (✽3)

Fusing Web Unit — (✽4) 111T53010 1 —

Oil Coating Unit —

Fusing Section

Fusing Entrance Guide Plate

Clean Replace

When

malfunction

occurs

When

malfunction

occurs

When

malfunction

occurs

When

malfunction

occurs

When

malfunction

occurs

When

malfunction

occurs

Upon call ———

Each time

each Imaging

Unit is

replaced

When

malfunction

occurs

200 K

200 K 111T-5010 1

———

121 K 111T-4410 1 —

———

34 K or

325,000

sec

———

Parts No. Qty

111T51020 111T51010

110G-5300 (120 V) 110H-5300 (230 V)

111T53020 1 —

Ref. Page in This Manual

each

1 —

☞ ☞

☞

☞ ☞

☞

D-38 D-60

D-38 D-61

D-25

D-26

D-38 D-39

D-40

—

D-40

D-41

Ref. Page

in Unit

Replacement

Manual

—

P-26

☞

P-26

☞

—

P-26

☞

P-19

☞

—

P-11

☞

P-21

☞

—

P-26

☞

P-22

☞

P-2

☞

P-6

☞

—

D-16

FrameMaker Ver.5.5E(PC) 7915/7920 DIS/REASSEMBLY, ADJUSTMENT

01.02.09

✽

1: Replace the Transfer Belt Unit, Transfer Roller Unit, Paper Dust Remover, and Ozone Filter at the same time.

✽

2: About 4.5 K after a waste toner near full condition has been detected.

✽

3: Forced to a stop when 110 K is reached.

✽

4: About 1 K after 17 K has been reached or a web near empty condition has been detected.

NOTES

• K = 1,000 copies

• The contents of the above maintenance schedule are subject to change without notice.

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FrameMaker Ver.5.5E(PC) 7915/7920 DIS/REASSEMBLY, ADJUSTMENT

01.02.09

2-4. Guidelines for Life Specifications Values by Unit

NOTES

• The life specifications values represent the number of copies made or figures equivalent to it when given conditions are met. They can be more or less depending on the copier operating conditions of each individual user.

• The initiation of a new copy cycle is inhibited upon 1 K after a near life condition has been detected for all units (except the Toner Bottle and Waste Toner Bottle).

Life

Unit

Toner Bottle — B/E

Waste Toner Bottle

Fusing Web Unit

20-cpm copier Oil Coating Unit

15-cpm copier Oil Coating Unit

Fusing Unit 101 K B/C/D/F

Transfer Belt Unit

20-cpm copier Imaging Unit (C, M, and Y)

15-cpm copier Imaging Unit (C, M, and Y)

20-cpm copier Imaging Unit (Bk)

15-cpm copier Imaging Unit (Bk)

Spec. Value

120 K A/B/C/D/F

Copying

Condition

40 K B/C/D/E/F

17 K B/C/D/F

33 K

A/B/C/D/F

26 K 26 K 27 K

30 K

27 K

A/B/C/D/F

50 K

47 K

Description

An approximate life value is 10 K under the specified conditions.

A waste toner full condition is detected when about 4.5 K copies are made after a waste toner nearfull condition has been detected.

The life specifications value is based on A4C or Letter C. A near life condition is detected when a web empty condition is detected or a predetermined number of copies are made, whichever arrives earlier.

The life specifications value is based on A4C or Letter C. A near life condition or a life condition is detected when the Oil Coating Roller has turned a pre determined period of time or a predetermined number of copies are made, whichever arrives earlier.

The life specifications value is based on A4C or Letter C.

The near life and life time values are detected when the PC Drum has turned or the Developing Unit has been energized for a predetermined period of time, whichever arrives earlier.

Near Life

Value

— 10 K

— 40 K

16 K 17 K

33 K 34 K

101 K

✽

120 K

(17400 M)

✽

4415 M

(30 K)

✽

4415 M

(27 K)

✽

6972 M

(50 K)

✽

6972 M

(47 K)

Life Value

1 102 K

✽

121 K

(17545 M)

✽

4562 M

(31 K)

✽

4562 M

(28 K)

✽

7122 M

(51 K)

✽

7122 M

(48 K)

M: minutes

D-18

FrameMaker Ver.5.5E(PC) 7915/7920 DIS/REASSEMBLY, ADJUSTMENT

01.02.09

✽

1: As a rule, the Fusing Unit is to be replaced at the same time that the Fusing Web Unit

is replaced a sixth time (17 K × 6 = 102 K). If the Fusing Web Unit is replaced before 17 K is reached, there will be a discrepancy in the replacement cycle, resulting in a near life and life value ranging between 90 K and 110 K.

✽

2: The life of the Transfer Belt Unit is controlled based on the number of copies made.

The life counter gives a time value display.

✽

3: The life of the Imaging Unit is controlled based on a time value. The life counter gives

a time value display.

• Conditions for Life Specifications Values

Copying Conditions 20-cpm Copier 15-cpm Copier Job Type A Making two copies per job Paper Size B A4 or Letter Color Ratio C C (color) to Bk (black) = 5 to 1 C (color) to Bk (black ) = 2.5 to 1 CV/M D 6 K 3.5 K Original Density E B/W = 5 % for each color No. of Operating

Days per Month

F 20 days (Power Switch turned ON and OFF 20 times per month)

D-19

FrameMaker Ver.5.5E(PC) 7915/7920 DIS/REASSEMBLY, ADJUSTMENT

01.02.09

2-5. Removal of Units

• Note that replacement of a unit may call for recheck and readjustments of some items.

Transfer Belt Unit

LED Unit

Fusing Web Unit

Oil Cleaning Unit

Fusing Unit

Imaging Unit

Hopper Unit

4004D182AA

NOTE

• For the removal of the Imaging Unit, Transfer Belt Unit, Fusing Unit, Fusing Web Unit, and Oil Coating Unit, see the Unit Replacement Manual.

D-20

FrameMaker Ver.5.5E(PC) 7915/7920 DIS/REASSEMBLY, ADJUSTMENT

01.02.09

(1) Removal of the Toner Hopper Unit

NOTE

1. Remove the Paper Output Cover.

2. Open the Front Door.

3. Remove the Toner Supply Door.

4. Remove the Hopper Left Cover.

5. Slide out the Imaging Unit (C/M/Y/Bk).

☞

Unit Replacement Manual

NOTES

• After the Imaging Unit has been pulled out, place the Imaging Unit lock lever back into the locked position.

• When sliding the Imaging Unit back in, make sure that the shutter is opened if the Imaging Unit Lower Cover is not to be used.

6. Remove two screws and the Right Front Cover.

4004D043AA

4004D044AA

4004D045AA

7. Remove two screws and the Front Door Switch Cover.

8. Disconnect three terminals.

✽

Terminals: Blue, white, and green from top down

D-21

FrameMaker Ver.5.5E(PC) 7915/7920 DIS/REASSEMBLY, ADJUSTMENT

01.02.09

9. Unplug three connectors.

10. Remove five screws and the Toner Hopper Unit.

4004D046AB

(2) Removal of the LED Unit

NOTE

1. Open the Front Door.

2. Slide out the Imaging Unit (C/M/Y/Bk).

☞

Unit Replacement Manual

NOTES

• After the Imaging Unit has been pulled out, place the Imaging Unit lock lever back into the locked position.

• When sliding the Imaging Unit back in, make sure that the shutter is opened if the Imaging Unit Lower Cover is not to be used.

3. Open the Right Door and Rear Left Cover.

4. Remove the Ozone Filter, Waste Toner Bottle, and Transfer Belt Unit.

5. Remove the Rear Cover and Rear Left Cover.

6. Remove five screws and the cover.

4004D229AA

7. Remove one screw and unplug one connector on the PIC Board.

4004D047AA

D-22

FrameMaker Ver.5.5E(PC) 7915/7920 DIS/REASSEMBLY, ADJUSTMENT

01.02.09

8. Unplug five connectors.

4004D048AB

4004D232AA

4004D024AA

NOTE

• Make sure that all four hubs are locked in position.

NOTE

• When unplugging the connector, make sure that

connector A (on the copier side) is disconnected. Connector B (on the LED Unit side) should not be disconnected.

9. Lock the Imaging Unit (C/M/Y/Bk) drive hub.

NOTES

• During the locking procedure, use care not to

touch the LED surface.

• Should the LED surface be touched, clean it with

the LED Cleaning Jig.

☞

D-40

D-23

4004D049AA

FrameMaker Ver.5.5E(PC) 7915/7920 DIS/REASSEMBLY, ADJUSTMENT

01.02.09

10. Remove two screws and slide out the LED Unit.

4004D050AA

Precaution for Reinstalling the LED Unit

• The lever of the LED Unit must be fit into the space between the metal bracket in the rear of the copier and another lever as illustrated below.

LED Unit Lever

4004D051AA

Precaution for Replacement of the LED Unit

• When the LED Unit is to be replaced, remove the ATDC Sensor from the old LED Unit and remount it on the new one. This step is not, however, necessary if the Imaging Unit is replaced at the same time.

D-24

FrameMaker Ver.5.5E(PC) 7915/7920 DIS/REASSEMBLY, ADJUSTMENT

01.02.09

2-6. Cleaning and Disassembly of the IR Unit

(1) Cleaning of the Scanner Rails

1. Remove the IR Right Cover and Original Glass.

2. Using a soft cloth dampened with alcohol, wipe the Scanner Rails clean of dirt.

NOTE

• Apply lubricant after cleaning.

4004D198AA

(2) Cleaning of the Mirrors (1st/2nd/3rd)

1. Remove the IR Right Cover and Original Glass.

2. Using a soft cloth dampened with alcohol, wipe mirrors clean of dirt.

4004D199AA

(3) Cleaning of the Lens

4004D001AC

4004D200AB

1. Remove the IR Right Cover and Original Glass.

2. Remove eight screws and the optical cover.

3. Using a soft cloth dampened with alcohol, wipe the Lens clean of dirt.

D-25

FrameMaker Ver.5.5E(PC) 7915/7920 DIS/REASSEMBLY, ADJUSTMENT

01.02.09

(4) Cleaning of the Original Glass

1. Using a soft cloth dampened with alcohol, wipe the Lens clean of dirt.

4004D201AA

(5) Removal of the Original Glass Cooling Fan Motor

1. Remove the IR Rear Upper Cover and IR Rear Cover.

2. Unplug one connector and remove the harness from one wiring saddle.

3. Remove two screws and the Original Glass Cooling Fan Motor.

4004D018AB

(6) Removal of the Scanner Motor

4004D015AA

4004D027AA

1. Remove the IR Rear Upper Cover, IR Rear Cover, and IR Rear Right Cover.

2. Remove the Original Glass Cooling Fan Motor.

3. Remove two screws and the reinforcement frame.

4. Remove four screws and the hinge support in the rear of the IR.

D-26

+ 71 hidden pages

Konica 7920 Wiring Diagram 7920fv1e

CONTENTS

1. SERVICE INSTRUCTIONS

2. DISASSEMBLY/REASSEMBLY